Stamp-machine.



Paten'ted luly 9, 190|.

c. H. yKmxusla. STAMP MACHINE.

(Application led Oct. 22, 1900.)

(No Model.)

e m Km w.,

A TTOHNEYS "Nrrnn STATES' CHARLES HENRY KRAUSE, OF SOUTHLAKE LINDEN,MICHIGAN.

sTAwiP-MACHaNE.

- SPEGIFIGATIGN forming part of Letters Pjatent No. 678,300, dated July9, 1901.

Application led October Z2, 1900. Serial No.. 33,894, (No model.)

T @ZZ whom, il; may concern:

Be it known that I, CHARLES HENRY KRAUSE, a citizen of the UnitedStates, and a resident of Southlake Linden, in the county of Houghtonand State of Michigan, have invented a new and Improved Stamp-Machine,of which the following is a full, clear, and exact description.

This invention relates to improvements in atmospheric stamp machines ormills for ores orthe like; and the object is to simplify theconstruction of this class of machine and particularly the machine shownin the patent granted to me under date of November 12, 1889, No.414,910, and' with other changes in construction I omit the fast andslow motion mechanism in said patent.

I will describe a stamp-machine embodying my invention and then pointout the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification,

' in which similar characters of reference indicate corresponding partsin both figures.

Figure 1 is a partial section and partial elevation of a stamp-machineembodying my,in vention. Fig. 2 is a sectional detail showing theair-cylinders and pistons.

The frame of the machine comprises a base 1 and uprights 2, connected bycross-bars 3. Mounted on the foundation is a mortar 4, in which thepestle or shoe 5 operates, said pestle being attached to a stamp-rod 6.Supported in the frame are diierential cylinders 7 and S-that is, thecylinder 7 is of greater area or volume than the cylinder 8. By thisconstruction a large volume of air in the cylinder 7 is forced into` thecylinder 8 of less volume, thereby creating a great pressure on thepiston 9, operating in said cylinder 8 and attached tothe rod 6.Operating in the cylinder 7 is a piston 10, the connecting-rod 11 ofwhich is attached to a crank ona crankshaft 12, that may be rotated byany desired means.

Arranged within the valve-casing 13,which communicates with .the uppercylinder 7, are

valves 14 and 15, the valve 14 being operated by movements of themachine,while the valve 15 is automatically opened by air-pressure. Avalve-Casin g 16 communicates with the cylinder 8, and arranged in thiscasing is a automatic.

spring-pressed upwardly-opening valve 17. The valve 14 has a rodconnection 1,8 with a lever 19, pivotally connected to one of theuprights 2, and as a means for adjusting the 'throw of said valve 14 therod'18 is made in two sections, connected by a turn-buckle or the like20. The lever 19 is designed to be raised at its free end to open thevalve 14 by means of a tappet 21 on the rod 6. This tappet is made inthe form of a pulley to receive a band for imparting a slow rotarymovement .to said rod.

In operation the piston 10, moving upward, produces between the twopistons a partial vacuumthat causes the lower piston to rise,consequently raising the pestle 5 until the tappet 21 comes in contactwith the lever 19. Then by continued movement the valve 14 is opened,allowing atmospheric air to pass in, raising the valve 15, and rushingin between the two pistons. The valve 15 will close just as soon aspressure is restored in the cylinder; but the valve 14 will notcloseuntil the stamp-shaft is moved down to the place at which it opened.Therefore this valve is As the upper piston 10 moves downward a greatpressure is produced, driving the lower piston down with great force andproducing a heavy blow of the stamping device. An air-cushion betweenthe pistons, however, will permit the pestle or stamping device toaccommodate itself to theamount of material in the mortar. After thelower piston passes the port leading into the valvecasing 16 theair-pressure is automatically eX- hausted through said valve-casing, thepressure, of course, opening the valve 17, and this valve is closed bythe outer atmospheric pressure after the inner air shall have been eX-hausted.

I have shown a projection or boss 22 on the lower side of the upperpiston 10, the object of which is to produce a greater displacement whena more forcible blow of the stamp is desired, and this boss may be madeof any size to suit required conditions. I do not confine myself,however, to this construction, as the lower side of said piston may bein one plane surface. The length of the stroke of the upper pist-on maybe the same as the lower piston or may be less; also, the ratio of thecylinders may be any quantity.

IOO

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. In a stamp machine or mill, two dil'erentialcylinders arranged one above the other, a piston operating in thesmaller cylinder, a stamping device carried by said piston, a valve forcontrolling the exhaust from the smallcrcylinder, apiston in the largercylinder and unconnected with the smaller piston, means for operatingthe piston in the larger cylinder, a valve-casing communicating withboth the cylinders, an inlet-controlling valve in said casing, a leverwith which said Valve connects, a tappet carried by the stem of thesmaller piston for engaging with said lever to open the valve, and anair-pressure-actuatcd Valve also in said casing, substantially asspecified.

2. A stamp machine or mill, comprising dif- CHARLES HENRY KRAUSE.

Witnesses:

HENRY C. KRAUSE, EDWIN SMETHERAM.

